Vibrator for sound-telegraph apparatus.



PATENTED MAR. 28', 1905.

A. A. LIND. VIBRATOR FOR SOUND TELEGRAPH APPARATUS.

APPLIUATION FILED JULY 17, 1903.

2 SHEETSSHEET 1.

INVENTOH,

ATTORNEY.-

UNITED STATES Patented March 28, 1905.

PATENT ()FFICE.

TROMILITARA AKTIEBOLAGET, OF STOCKHOLM, SWEDEN.

VIBRATOR FOR SOUND-TELEGRAPH APPARATUS.

SPECIFICATION forming part of Letters Patent No. 786,041, dated March28, 1905. Application filed July 17,1903. Seriai No. 165,979.

To all whmn it may concern:

Be it known that 1, Anvrn ANDERSSON LIND, a subject of the King ofSweden and Norway, and a resident of Stureparken 4, Stockholm, in theKingdom of Sweden, have invented certain new and useful Improvements inVibrators for Sound-Telegraph Apparatus, of which the following is aspecification, reference being had therein to the accompanying drawings.

This invention relates to vibrators for soundtelegraph apparatus. As iswell known, the vibrator comprises an eleetromagnet in which one end ofthe coil is connected with a springcontrolled armature which normallybears upon a contact, but when attracted interrupts the current in thesaid coil in the same manner as the armature in the galvanic bell. Thesaid vibrator is by means of a key intermittently inserted into theprimary circuit of an induction-coil for instance, according to theMorse system the secondary winding of which coil is connected with thetelegraphic wires, alternating currents being thus created in the saidwires each time the vibrator is caused to operate by means of the key,which currents are perceived as sounds by means of a telephone at thedistant receiving-station. In such vibrators it very often happens thatthe armature, owing to imperfect adjustment or for other causes, is notsufliciently attracted to interrupt the current when the key isdepressed. Consequently either no signals at all or incorrect signalsare transmitted.

The main object of this invention is to obviate this disadvantage. Forthis purpose the vibrator is arranged to form the key proper of theapparatus, so that the armature is positively operated at eachdepression of the key, and thus under all circumstances is caused tovibrate, the subsequent vibrating motion being, as usual, effected bythe electromagnet.

In the accompanying drawings the invention is shown applied to acombined telephone and sound-telegraph apparatus specially constructedfor use in the army or in other service where the apparatus must beportable and occupy but small space.

Figure 1 is a side view and part longitudinal section of the apparatus.Fig. 2 is a front view of the apparatus. Fig. 3 is an enlarged 5sectional view of the upper part of Fig. 1. Fig. 4c is a diagram of thecircuits.

In a casing or box 1 a dry battery 2 is mounted, provided at itsrespective ends with terminals 3 and 4:. to an insulating-disk 6 in asupporting-plate 7 in the casing, and a contact-spring 8, fixed to acover 9, screwed on the said casing, bear against the terminals 3 4. Theplate 7 is fixed at some distance from the upper end of the casing, achamber 17 being thus provided in which the induction-coil 10 ismounted. The cylindrical iron core 11 of the said coil is hollow, andthe electromagnet 12 is loosely inserted into the same from the open endof the 6 5 core. The wire of the electromagnet is wound on a cup-likecore 13, to the lower end of which is fixed an iron casing 14:,inclosing the said electromagnet. The said casing is scoured to the coreby means of a screw 15, the 7 head of which forms a contact-piece. Thecore 13 is connectedwith one end of the said wire. Between the bottom ofthe casing 14: and the said screw-head is disposed an insulating-plate16, and a similar plate 16 is disposed above said bottom and between itand a plate or disk which bears on the lower end of the magnet.

A cap 18 is screwed on the top end of the casing 14 and bears a screw 19for the adjustment of the springy armature 20, which is fixed on 30 theelectromagnet and connected with the other end of its wire. Between thesaid screw 19 and the armature 20 is disposed a leafspring 21, which isfixed to the cap 18 and bent at an angle, as shown. The spring-ar- 5mature 20 normally bears upon the free end of the said spring 21. By thesaid arrangement the armature 20 can be accurately adjusted by means ofthe screw 19. 22 is an apertured cover screwed on the end of the 9casing 1.

As will be seen from the above description, the electromagnet, itsarmature, and the adjusting-screw, which together constitute thevibrator, form a connected whole which is movable in the hollow core ofthe inductioncoil and can be removed from the same after the screwingoff of the cover 22 for inspection A contact-spring 5, fixed 55 or thelike. By the said arrangement the vibrator and induction-coil occupy aminimum of space. A spiral spring 23is mounted between the inner wall ofthe core 11 and the electromagnet. The lower end of said spring 23 bearsupon a flange 24 on the inner wall of the said core, and the top end ofthe spring presses against the edge-f the cap 18. In this manner thespring 23 tends to move the vibrator lines when telephoning is to takeplace.

than that of the casing 1, lines, Fig. 1. The ends of the secondarywinding of the induction-coil are connected with clamping-screws 40 41,forming the line-terminals.

I outward. A cup-shaped push-button 25 is 28, 30, 42, and 43 arecontact-springs in a mounted in the aperture in the cover 22. Theswitching device acted upon by the vibrator cap 18 supports the edge ofthe said button, (key) and serving to bring the receiver and which isretained in the cover by a flange 26 transmitter out of and into action.The telethereon. When the said pushbutton is phone apparatus and thesaid contact-springs I pressed inward, it moves the vibrator 12 are notparticularly described, as they do not against the tension of the sprin23 until the orm any part of this invention. head of the screw strikes acontact 27, fixed Fig. 4 shows the electrical connections. in the disk 6and connected electrically with When the parts are in the position shownin tie spring 5. The core 11 is connected with this diagram, telephonimcan take place, a

2 one end of the primary conductor of the inprimary current flowin fromthe battery 2 duction-coil 10, the other end of which is conthroughcontact 28, contact 42, connectingnected with the contact-spring 8through the spring a, (at the transmitter,) the diaphragm wall of thecasing 1. Thus as the head of 6, carbon particles 0, the ring g, theshaft (Z,

the screw 15 strikes the contact 27 a current and the primary circuit ofthe induction-coil 2 5 will pass from the battery-terminal 3 through 10.When the electromagnet 12 is depressed the spring 5, the contact 27, thescrew 15, the for telegraphing, the receiver 34 is brought electromagnet12, its armature 20, the spring out of action by the circuit 0, 30, 43,and f. 21, the cap 18, the core 11, the primary con- The current throughthe transmitter is interductor, the wall of the casing-1, and theconrupted at 42. primary intermittent our- 3 tact-spring 8 back to thebattery. In this rent flows from the battery 2 through conmanner theelectromagnet is excited. When tact 27, core 13, armature 20, contact21, cap the screw 15 strikes the contact 27 and the 18, and the primaryof the induction-coil 10 electromagnet 12 is consequently arrested,nduced cuiients then flow thiou h L, the t e a1 matuic 20, by ieason ofits inertia Wlll secondary of the induction COIl and the circontinue tomave downward and leave the cuit e, 30, 43, f, and L.

spring 21, which is stiffer than the spring-y {aving now described myinvention, what armature, so that the vibrations of the arma- I claim asnew, and desire to secure by Letters ture are initiated, so to say, andunder all Patent, is the circumstances will begin, such Vibrations 1. Avibrator for a sound-telegraph appa 4 being then caused to continue bythe electroratus, having a guide, an electroma net its magnet so long asthe screw l5is held in cona1 mature, and the contact for said a1 matuie,tact with the contact 27. When the button connected to form the key ofthe apparatus 25 is released, the vibrator and the button are andmounted slidably in said guide. moved outward by the spring 23. Thus it2. Avibrator fora combined telephoneand will be seen that the vibratorserves also as sound-telegraph apparatus, having a hollow the key of thetelegraph apparatus. The non coie tor the induction-coil ot theteleelectromagnet is guided during its movement phone device, anelectromagnet, its armatui e, by a projection 32 on the inner wall ofthe and the contact for said armature connected core 11 engaging a slot33 in the wall of the to form the key of the tele iaph device and 5casing 14. mounted slidably in said core.

34 is a casing containing the receiver of the In witness whereof I havehereunto signed telephone apparatus, and 35 is a casing inmy name in thepresence of two subscribing closing the transmitter of the saidgamarabws. witnesses.

he said casings are carried by tu es or ars w T 36 36 and 37 37,respectively, sliding tele- ARVID ANDERbSOD LIND' l/Vitn esses ERNSTSvAN vIsT, ROBERT APELGREN.

38 38 and 39 39, fixed to the receiver and transout a certain distancescopically in tubes the casing 1, so that mitter can be drawn

